I hate to break it to you, but they are old video games at this point. The NES and SNES were considered old video games by the PS2/GCN/Xbox era when GameStop/EB Games/etc we’re dumping their inventory. That was about 2002-2003. Think about the release dates for those consoles and compared to those years. It’s now 2021, farther out from the release dates of the PS1 and N64. Heck, I’d argue that the PS2/GCN/Xbox era could be considered old video games at this point.
Personally, I am with Phil Spencer and believe that old games should be playable on new technology, just like old movies are getting rereleased in 4K. I love my carts, but I’d gladly buy old games if they were properly preserved on new consoles.